hi pls help me find this story


from what i remember the girl is working at a airbnb kinda thing and the guy is there to visit¿ or stay for a while. the girl is the guy's first love from when they're a student and the girl rejected¿ the guy. the girl tried to avoid the guy
because she remembers and is embarrassed¿ but the guy will always found a way to meet the girl. the girl want to give the guy wine¿ alcohol¿ but she invited the guy to drink together even though that was not her plan and then did the deed because they're drunk

its a little boy but he never dies and everytime he touches things like plants it will grow fast. he outlive his parents and he lives in a mountain. there's also a part where he save a little girl but eventually he also outlive her