Kim In-kwon,
Kim Soo-ro,
Lee Min-jung,
Lee Ha-nui,
Choi Won-young and Yoon Park
In this Drama,Kim Young-soo (Kim In-kwon) working at department store accidentally falls from a roof and is killed while getting distracted by some family problems and overtime issues. His company writes his death off as a suicide in order to not receive blame for overworking him.Han Gi-tak (Kim Soo-ro) is a former gangster running a restaurant. He has loved actress Song Yi-yeon (Lee Ha-nui) for many years,Her ex-husband, Cha Jae-gook (Choi Won-young) has whipped up a scandal to force her to give him their child, and threatens Yi-yeon with it. Just as Gi-tak figures this out, he gets in a car accident and is killed at the same time as Young-soo.
Young-soo and Gi-tak both arrive in the afterlife, but they both feel that they must return: Young-soo to reconcile with his wife and prove his death was not a suicide, and Gi-tak to protect Yi-yeon. They are given two months and return to life in new bodies: Young-soo as Lee Hae-joon (Rain), a handsome young man; and Gi-tak as Han Hong-nan (Oh Yeon-seo), a pretty young woman. They have three rules:
1. They can not reveal their true identities.
2. Revenge is forbidden.
3. They cannot engage in human affairs.
If any of these rules are broken, the fact that either of them ever existed will be erased.
Source – https://en.wikipedia.org/wiki/Please_Come_Back,_Mister