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For me it was like the author didn't know end it so he just put Jinwoo ang Chae-In together with a son. I felt it a little bit rush that part. ╮( ̄▽ ̄)╭

SPOILER
He did meet his father. He died, yes, but *heavy spoiler* using the artifact, went back in time 10 years with all people. Everyone living, now no monster or hunter on earth, no gates, everyone forgot. His father didn't forget at first, since he borrowed power, but still chose to forget as his son didn't want him to remember.
SPOILER for the ending, but not a spoiler?? ? kinda
s o the ending was sad? But not cry-like sad, but more like emptiness and thoughtful like sad. They are happy, but I just feel sad about our protag.