
Calm down he just thinks that cheng would leave him after knowing that wo wo is his child.. i think that his decision comes from the trauma that he experienced in jail and being abandoned by his family for having a womb like women have .. you can't really blame him to be honest:( he's been through so much 。:゚(;´∩`;)゚:。

Its probably because maybe he is afraid, i think i remember him once saying that a man being able to get pregnant and give birth is weird or some shit and there is also a whole fucking judgemental society plus their relationship isnt that stable(in my opinion) and ci nian need some space before he can say truth
SPOILERS
In the next chapters cheng will find out and tell wowo that he is his father but then he will tell wowo to keep it between them so that maybe he can hear from ci nian and i think you should look foward to the next chapters since they will be quite cute(๑•ㅂ•)و✧

Cinian is intersex, so he has a womb even tho hes male.. as for his parents, its not clear how they found out; maybe cinian menstruates and they saw that.. but to his father, cinian is a monster bcs hes a man who can give birth, so i can understand why cinian doesnt want anyone else to know about his secret.
I fucking don't get why ci nian is so persistent on denying that wo wo is his true son and the other parent cheng, how can he be so selfish? cheng didn't do any big reason to deserve to not know that he had a son. This is so frustrating