★Translated in Thailand
★GOZKNOCK ENT Editor’s Choice
★What if you get 100 days to live the way you want, right before death? A soul change between a high school student who wants to live ’a good life’ and an elderly president of a large corporation who ’misses youth’!

Chairman Ju Seok-ho, a 65-year-old cancer patient becomes a high school student.
Chairman Ju Seok-ho of SH Logistics has devoted his life to work. After being diagnosed with terminal cancer, he dies lonely in his apartment. But later, he wakes up, not in the next world, but in a stinky, cramped room. He learns that he is in the body of an 18-year-old high school student named Kim Yu-shik and heads straight to his apartment where he runs into Yu-shik, who is now in Seok-ho’s body.

Only 100 Days
It turns out, Yu-shik also had a car accident, and his regret is that he wasn’t able to live his life to the fullest because he did not have enough money. At the time of his death, Seok-ho also regretted that he spent his life with the sole purpose of making money. Is this occasion a last gift from God? They find the number 100 on each of their body that didn’t exist before they died, and see the number goes down every day. They soon learn that the number stands for the number of days left for them on the Earth.

Protect the firm!
Since the switch has already happened, they decide to cooperate with each other so they can spend their 100 days as they wish. Their different thoughts sometimes lead to arguments, but soon, they grow comfortable with each other. Soon, a danger approaches. Kim Beom-ju, the president of SH Logistics, goes after the chairman’s position, accusing Seok-ho of having dementia. Behind Yu-shik, Seok-ho tries to protect his firm from the hands of Kim.

Second death after the 100 days
Seok-ho and Yu-shik successfully keep Kim at bay. But not long after, Yu-shik suffers an unbearable pain. Yu-shik happens to get cancer caused by cancer cells in Seok-ho’s body. They realize that no matter how much they enjoy their new lives, they are destined to die again. Yu-shik believes that unlike him, Seok-ho may have a chance to live by avoiding the car accident. He asks Seok-ho to live his life on his behalf.

The fated day
From that moment on, Seok-ho secretly prepares something for Yu-shik. And on the 100th day, Yu-shik dies of illness and at the same time, Seok-ho gets hit by a truck in Yu-shik’s body. What will happen to them at the end? Will they be able to confront death without any regret?