Losing more of himself each day, Do-hun works on creating good memories with A-ram, and Brian offers to film a video to preserve them.

When Do-hun’s condition reaches new lows, Su-jin recounts their story to him. The patent for his chocolate bar is found to have been stolen.

Su-jin plays along with Do-hun, who thinks he is in his 20s — but runs into trouble when he gets jealous of Kyeong-hun.

Do-hun’s Alzheimer’s disease progresses, erasing even Hang-seo. A-ram wonders why they can’t play together — and Su-jin must explain why.

To A-ram’s delight, Do-hun attends her kindergarten event, and the family goes on its first vacation. The chocolate bar relaunches under a new name.

Forgetting he needs to stay away, Do-hun heads to Kwon A-ram’s kindergarten. Mun Kyeong-hun carves out a place in Su-jin’s life.

Su-jin worries that Do-hun has reappeared to take A-ram away from her. Meanwhile, Brian and Ye-rim come across each other on a film set.

For the first time in years, Do-hun and Su-jin come face-to-face. Choe Hang-seo and Baek Su-a throw a wedding celebration. Brian meets Ye-rim’s fiancé.

Do-hun’s proposal for launching a sugar-free chocolate bar falls through. Su-jin locks herself away in her apartment, worrying her friends.

Jo Mi-kyeong and her mother disapprove, but Su-jin decides she wants to be by Do-hun’s side — and brings A-ram to him.

Lee Su-jin’s joyless marriage to Kwon Do-hun — with whom she was once deeply in love — reaches a breaking point when he refuses to have a baby.

While Do-hun hides secrets from Su-jin, she considers an unorthodox idea to try and force him into a speedy divorce.

Brian Jeong and Son Ye-rim cook up a scenario for Su-jin’s divorce project, and Do-hun spends time with his mother-in-law.

Moving her plan forward, Su-jin gets Do-hun to agree on a fishing trip with her. Brian stands up Ye-rim for dinner.

With his symptoms accelerating, Do-hun knows he must give Su-jin what she wants — or risk her finding out about his illness.

Eun-gyeol gets stuck in 1995 and doesn’t know how to return to the present. What’s worse is that he meets his young father who can talk and wants to start…

The competition takes a new turn due to one player’s surprising move. Shortly afterward, the truth surrounding the move is revealed.

The contestants struggle to solve the Devil’s secret. During the fifth main match, Lee See-won attempts to face off against ORBIT.

It’s day 4, and a group commits a fatal mistake. As their allegiances waver, other contestants come closer to unlocking the Devil’s secret.

A betrayal leads to an unforeseen elimination. Emotions flare among the remaining players, but in this prize match, they must work as a team.

The ORBIT alliance or a new alliance? While the contestants rethink their loyalties, someone commits an act of betrayal during the main match.