Not Myself (2006)

Ryo and Ayla are a pair of lovers in the same office. Ryo is a workaholic, while Ayla feel that Ryo's love is not serious. On the other hand, their boss, Ariel, really wants Ayla's love. One day Ariel tried to hit Ryo with a car, causing Ryo to die on the spot while Ariel fell into a coma. However, Ryo's spirit is still in the world, he knows that he can use the bodies of people who are in a coma, on the condition that he would die completely if other people discovered his true identity. But whose body? There was no other choice for him, only Ariel's body was available.