Dr. Tin finds himself in a time loop, reliving the same day over and over again. Every day, he is forced to watch Tol die in front of him. Can he save a life and change the future?

After repeatedly failing to save Tol's life, Tin attempts to intervene earlier in the day to help Tol avoid the accident altogether. However, his attempts have consequences as changing the past effects the future.

Realizing that Tol won't listen to the warnings of a stranger, Tin uses his next loop to try to build a relationship and trust with Tol.

Tin forces himself to stay awake as he awaits the autopsy result from Tol's death after the blood test revealed no alcohol in his system.

Tin takes a new strategy of getting Tol to the hospital in hopes of getting him to take test for his heart. Afterwards, he rushes to Rit's house to stop him from drinking the insecticide.

Tin waits for Tol outside the party, and Tol remarkably survives the night due to Tin's actions. However, the next day tragedy strikes on multiple ends disrupting the timeline in ways Tin hasn't yet seen.

With the realization of the root causes of Tol's death, Tin realizes he will need to go back further in time to create the impact needed to save Tin, as well as Rit and Fang. However, the further Tin goes into the past, the less he can remember about what has already transpired.

After spending the day with Tin, Tol awakes from a nightmare where he saw his own death repeatedly. The next day at school, Tol remembers Tin's advice about doing the right thing to make amends with Rit.

Tol's father hosts a party to celebrate his project achievement, but as the party nears Tol has an overwhelming feeling something bad will happen.

After locating Jinta, Tol is offered one chance to change the past and correct their future. However, Jinta's opportunity does not come easily, and Tin cannot remember his relationship with Tol at all.

With Tin's memories gone, Tol struggles to get close to him and earn his trust. Meanwhile, Dr. Sak uses Tin's pain from his sister's death to try and lure him into his scheme.

Dr. Doi threatens the safety of Rit, Gap, and Sing. Dr. Sak is pushed to take extreme measures against Tin after Dr. Doi's sudden change of plan.