Ye Shaoting is not the impulsive type; on the contrary, he is a very rational man.
He can accurately calculate gains and losses, as well as the benefits these gains and losses might bring him.
From the moment he inexplicably chased after Zuo Qing, he knew that this girl was different in his heart.
He knows himself better than anyone.
This is a sign of him being moved.
So when she proposed marriage, he agreed, but he agreed in a different way because he didn't like being pursued by a girl.
He knew she made an impulsive decision, and being skillful at calculations, he knew that as long as he spent more time with her, there was a 90% chance he'd fall in love with her, so he would definitely not refuse her impulse.
For him, this was an excellent opportunity.
Not actively plotting is his only bottom-line demand of himself.
But this was a request she made voluntarily.
The person he needed came to him; Ye Shaoting felt he had no reason to refuse.