After a meal, He Zhilan somehow ended up with five non-blood-related brothers, all of whom were extremely influential, without ever having the chance to refuse.
At the end of the meal, everyone had given He Zhilan a gift as a token of formally acknowledging her as their younger sister. She had no choice but to accept these presents reluctantly.
Lin Chan was the one who took her back again. On the way home, he was a bit upset, mentioning the lunch had gotten out of his control. He had originally planned to introduce Zhilan as his adopted sister and inform everyone that he was looking after her. But somehow, she ended up being recognized as everyone's sister and he was pushed into fourth-brother position!
However, Lin Chan wasn't a fool. After some thought, he realised Xing Ye calling her sister-in-law was probably the reason for this turn of events.