It's just an idea~ They are actually a fake father and son~
Due to special reasons, Qiu Shi left his son Qingze when he was very young and did not meet his son before Qingze turned eighteen. One day the two met. Qiu Shi felt guilty for not taking good care of his son in the past eighteen years, so he treated his son well and took care of him with full satisfaction. As a result, his son took care of him.
Qingze: I like you. (Shy)
Qiu Shi:...? No, you can't like me.
Qingze: Why?
Qiu Shi: Because... Because... Forget it, just like it if you like it. (In tears)
Qiu Shi: You can like me, but please don't do anything. (In tears)
Intention: Just a thought!