This was one of his strong suits and Marshal Yi knew it. Thus he deliberately stimulated Yi Chen trying to cloud his mind that he won't be able to come up with a solution favorable to himself.
Unfortunately, he underestimated the weight of Zi Han in Yi Chen's heart. In less than a second Yi Chen had already figured out the best outcome. He suddenly turned on his heel and said, "Fine," his tone decisive like he was really going to tell Zi Han the truth.
He was bluffing but his father didn't know that. Only the heavens know how devastated Zi Han would be if he finds out the truth, especially from him. There must have been a reason why Zi Xingxi never told her son about it. Even Zi Feiji made the very same decision. It must be that they really didn't want him to know.
Yi Chen stepped over the threshold his expression serious but he was silently counting down in his heart. As soon as he reached one he heard his father calling him back.