Previously, he thought of the other person merely as a tool for enhancing favorability.
You live a better life with the money I give you, and I get attribute points and cashback; each of us takes what we need.
But now it's completely different.
Now, he wants both favorability and the person!
Since he flirted with her and made her fall in love with him, he should also love her back and make her his woman!
Although it's somewhat scummy, this kind of fickle-heartedness is much better than flirting without any responsibility.
Of course, the premise is that he likes her too.
Previously, he restrained himself from crossing the line due to his responsibility towards Sun Yi and his inner morality.
But Zhou Yujie made him take that step.
And after taking that step, it was a whole new world.
After all, once the first time happens, everything that follows is much simpler.
So, his current attitude towards Han Kexin is no longer that of merely using her as a tool.