Running Man: Season 1, Episode 645 - Crash Course in Luck (2023)

The Running Man episode 645, "Crash Course in Luck," begins with the members being gathered for a special mission built around choosing mentors, and the atmosphere is playful but competitive from the start. Joo Woo-jae and Roh Yoon-seo join the cast, and the members are told that their choices and pairings will shape how the game unfolds, immediately putting everyone in a position where social strategy matters as much as luck.

As the opening round develops, the members move through the mentor-selection process while trying to read one another's intentions and maximize their own chances. The episode frames the game as a test of whether the participants can secure an advantageous mentor or partnership, and the early exchanges are filled with quick reactions, surprise at who is chosen, and visible tension whenever one person's decision changes the options for everyone else.

The cast then enters a sequence of luck-based challenges and elimination-style decisions, with each result affecting the next round. The members repeatedly face moments where a single choice or outcome determines who gains an advantage, who is left vulnerable, and who gets pushed into a worse position, so the episode's momentum comes from watching the group react immediately to each new twist rather than from any long continuous task.

Throughout the middle portion, the guest participants remain central to the shifting team dynamics, and the members continue trying to outmaneuver one another through a mix of persuasion, opportunism, and timing. The episode keeps the focus on who can exploit the "luck" element best, so each round produces new pairings and new pressure on the cast to adapt without warning.

In the final stretch, the game reaches its last decisive phase, and the remaining participants are forced to rely on the outcomes they have accumulated through the earlier rounds. The ending is built around one last lucky result and the reveal of who has been able to stay ahead through the episode's shifting mentor and team structure, closing the competition on the same playful tension that drove the rest of the episode.

The episode ends after the final result is determined and the cast reacts to the outcome of the luck-driven game.

The episode ends with the members and guests finishing the final round of the mentor-selection game, and the last lucky winner is revealed after a tense closing match. The losing side faces the episode's penalty, which is the show's usual comedic punishment rather than a serious consequence.

In the closing stretch, the members and guests are still in the middle of the episode's "choose your mentor" competition, with Joo Woo-jae and Roh Yoon-seo taking part alongside the cast. The final segment builds around one last round of luck-based selection, and the teaser material for the episode frames it as the moment to discover "who will be the lucky one." The episode's conclusion follows the variety-show pattern of a decisive ending result, after which the loser receives the group penalty.

Scene by scene, the ending plays out in a simple chain of events. First, the remaining participants face the last round of the challenge and wait for the final outcome. Then the episode identifies the final lucky participant, completing the game's selection process. After that, the losing participant is punished on camera with the cast's comedic penalty, which in this episode is whipped cream slapped onto the loser's face by the others. The moment is presented as a playful finish rather than a dramatic defeat, and the main cast members remain in their usual roles as competitors and pranksters rather than changing in any lasting way.

For the main participants at the end, the result is straightforward: one contestant ends as the winner of the luck-based final round, while the loser becomes the recipient of the punishment. Joo Woo-jae and Roh Yoon-seo finish as guest participants in the same game structure as the cast, and the Running Man members close the episode by carrying out the penalty together.

There is no evidence in the provided results that Running Man episode 645, "Crash Course in Luck," has a post-credit scene.

The search results describe the episode's premise and where to watch it, but none mention any extra scene after the ending or credits. The only "no post-credits scene" result in the set refers to the unrelated film The Running Man, not the variety show episode you asked about.

If you want, I can also describe the episode's ending based on available summaries.

Running Man Episode 645 is presented on KOCOWA+ as a school-style challenge in which both the members and guests must choose one of the teachers to improve their skills for TV shows. The question most viewers ask here is which guests appear and how they are divided into the episode's competitive structure, because the premise centers on teacher selection rather than a conventional mission start.

The episode's promotional title, "Last Round! Who will be the lucky one?", shows that luck is the key mechanic, so viewers commonly focus on which members end up competing directly in the rounds and how those matchups affect the result. The episode page also frames the challenge around choosing teachers and skills, which suggests the cast is sorted into competing groups rather than moving as one unified team.

The episode description says the members and guests must select one of the teachers to enhance their skills for TV shows, which means the teacher-selection segment is a concrete plot element viewers often ask about. Because the promotional materials emphasize this setup, questions usually center on what the actual classroom-style activity is and how the teachers influence the competition.

The promotional wording "Who will be the lucky one?" makes clear that chance is not just a background feature but the main driver of the episode's elimination or advancement structure. Viewers therefore often ask which specific moments depend on random draws, lucky picks, or other chance-based outcomes that change the cast's path through the episode.

Because Episode 645 combines a school concept with luck-driven rounds, people commonly ask which Running Man members show the strongest reactions, biggest frustrations, or most memorable wins and losses during the missions. The most searched character-specific questions usually target the members' behavior inside the classroom-style setup rather than the episode's overall premise.

Yes. Running Man episode 645 is generally family friendly as a variety show episode, with the main content being games, banter, and physical comedy rather than graphic or explicit material.

Potentially objectionable or upsetting elements for children or sensitive viewers may include: - Slapstick physical competition such as pushing, chasing, falling, and rough game-play. - Teasing and playful sarcasm between cast members, which can sometimes feel loud or embarrassing for younger viewers. - Competition stress or scenes where contestants are mocked, frustrated, or put on the spot during missions. - Mild romantic or personal teasing is possible in Running Man generally, though not typically explicit.

Based on the available episode descriptions, there is no indication of graphic violence, sexual content, or strong profanity in this episode.