From what I gather (I could be wrong though so anyone feel free to correct me) it's because the child Hawon's dad kidnapped in the past was Taeha and now he's out for revenge and Hawon is afraid that he'll torture him for the rest of his life. In Hawon's eyes, escaping from Taeha is the better option and so he's willing to trust Aeil over Taeha because Hawon's found a new purpose of living???
in the video of taeha's kidnapping he tells the kidnapper to hide his son, which is hawon, and that if he finds him he will make him go through something more interesting than russian roulette. hawon is afraid of being tortured or killed once taeha got what he wanted so he ran
good lord every update, MC's situation becomes even worse
but also, can someone explain to me why Hawon couldn't just trust Taeha with the wikileaks??? It seems likes giving Taeha what he wants is much better than trying to run away from him