Young Master is a term of respect.
Although Yang Chen didn't mind, he didn't want to spend so much effort just to have someone not even address him respectfully.
Now, with the Gold and Silver Dragon Plates in his hand, he could clearly feel that he and Qingyin had formed a close connection. This connection allowed him to do whatever he wanted with Qingyin. He couldn't help it - strictly speaking, he was now Qingyin's master, and Qingyin was his slave!
The most crucial part was that Qingyin had brought this upon herself.
At the moment, Qingyin seemed somewhat unwilling, but after a while, she spoke softly, "Young Master Yang Chen!"
Yang Chen grinned, "Miss Qingyin, you really didn't need to do all this in the beginning. The Gold and Silver Dragon Plates are meaningless. Do you know why? Because I didn't have that many suspicions from the start, but you were overly sensitive and insisted on doubting me!"