The expression on Lin Haotian's face was extremely peculiar when he saw the sincere look on Yang Zhen's face.
Initially, Lin Haotian was only there to test how much of a potential threat Yang Zhen could pose. If the opportunity presented itself, he might have even killed Yang Zhen, who posed a threat to him.
No, it wouldn't be fair to call Yang Zhen a threat to him. To Lin Haotian, Yang Zhen barely posed any trouble. Being accustomed to being lauded by the western region as a single individual for years, the sudden emergence of Yang Zhen was somewhat disconcerting to Lin Haotian, who desired to nip this potential threat in the bud.