Yes, Sheng Qianchi is convinced that Gu Jiayin likes him. Although her feelings for him aren't as intense as his are for her, her heart isn't as indifferent as she makes it seem.
She cares about him, and the late-night phone call last night proves it.
Chi Ye was right; her identity is definitely more complicated than it appears, and she must have a powerful backing. Her return to Licheng City must have a hidden motive, but he just hasn't discovered it yet.
The phone call she made last night clearly indicates she knew someone was going to attempt to assassinate him.
He remembered the last words Chi Ye said to him before they parted tonight,
—For you, Gu Jiayin might be a dangerous existence.
Yes, he doesn't deny it. This assassination attempt alone is enough to show that she could bring him unpredictable danger.
But, none of this will sway his desire to have her.