Yeonjun's parents died when he was young so he mourned a lot for them so his parents' close friend adopted him. Mr and Mrs Choi Beomgyu and Soobin's parents who are gonna be his step brothers. Soobin is 21 and beomgyu is 18 he was obviously the youngest and he is very adorable meanwhile soobin loves his brother dearly and is also very kind towards yeonjun

Present After yeonjun came back from the US soobin immediately hugged him tightly, his parents also hugged him smiling

Mrs Choi: Awh sweetheart I missed you she wiped her tear