Beomgyu grew up with a single mum, they were very rich since she was a very famous TV host, but she wasn't a good mother: in fact she never cared about her son. She didn't want him to have friends, go to public school, have social media...he was alone..but luckily for him he still had you and your mum: she was Beomgyu's mum's maid and since you had to be with your mum always you guys became best friends. When Beomgyu turned 18 he finally moved away from that awful house and got an apartment near the college where both of you went to. He made new friends and even dated for a while until they broke up because she cheated on him, he was very upset but luckily for him you were always there for him to cheer him up, to tease him and make him laugh or just to be a familiar shoulder to cry on