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It's a bl manga which has time travel in it. The story goes like this: the boy(i forgot the name but definitely in his early 20s) decided to go to his father's place which he hasn't seen for years then things got awkward for both of them and one sunny morning the boy got trip on the yard which triggered the time travel back in his many many years ago when he hasn't been born yet and met a boy there which turns out to be the younger version of his father but without him knowing.
Thing's got intimate but as you expect it, things didn't go the way they want then the boy got trip into the same yard and again triggered the time travel back to the present day. So yeah, this is incest. We read and we don't judge. (๑•ㅂ•)و✧