I don't blame simoon, I am 200% sure he wanted to be with the professor and take care of the beta together. But belonging from such a family and having that type parents ( any parents wouldn't support their children who are teenagers to have child , my parents also will not even though I am 20+) he had no way of saying or expressing his feelings. 
I don't blame him ! 

Bruh............... Chungyoung really has it hard. The plot was still trash, but in this chapter spesifically, i can't NOT support him but not also fully support him because he cheated on his own son . At the age of 15.... he has to take care of himself bc nobody got his back (the director supporting him is because of his quick thinking too).