Knows about William's Engagement

After the evening self-study, Mo Ci, who was far away in Li City, suddenly received a message from Molly. Before he could see what she sent, Molly's call came in with a flurry of inquiring and concerns. She even proposed to offer him spending money. Mo Ci felt somewhat unadjusted to this, but thinking that his elder sister may have become more sensible after going to university, and her temperament had changed, he didn't give it more thought. He was also relieved by his sister's change. "Xiao Ci, elder sister has sent you a problem on WeChat, weren't you self-studying the first-year university math course? Take a look and see if you can solve it." Mo Ci opened WeChat to take a look. It was exactly the "heavy responsibility" that Molly received from Xu Zhiyi. "Where did you get this problem from? This is not a university math problem at all." Mo Ci didn't understand the problem at all. Molly lied without changing her expression or heartbeat, "The teacher gave us this. Whoever solves it