Hyunjin had a pretty sad background, His mother lied to him and his twin sister about their father being dead but actually, Their father was merman but sadly, he couldnt stay on land any longer and returned to the ocean...Hyunjin learned it the hard way when he suddenly couldn't breath when a lady made his heart flutter...Hyunjin leaned that he was a merman and could only turn into a merman if he fell in love or atleast if someone made his heart flutter