Hello Ghost (2010) on Netflix

Plot summary

Sang-man is depressed, unsure of his past, and does not know who his family is. He overdoses on pills, survives, then jumps from a bridge into a river and is pulled out. In the hospital he sees a smoking man beside him whom nobody else can see, and comes to know four invisible companions: a boy in elementary school, an elderly man, a young woman who cries often, and that smoker. They are ghosts, and they follow him to his apartment. A shaman explains that they borrow his body to finish pleasures they were denied in life, and that he cannot die until they move on. Sang-man agrees to help them, on the condition that they then leave him alone. He also meets the nurse Yun-soo and feels drawn to her.