Wang Cai thought he was quite generous to these people. Although each of them exhibited hostility towards him, regardless of whether they intended to attack or to mock him, Wang Cai never laid a finger on them, nor did he harm them. Instead, he gave them a chance to mend their ways.
Mu Can trailed far behind without showing himself, nor did he intervene to stop Wang Cai. He chose not to show himself because he felt that staying beside Wang Cai was too embarrassing, and his inaction was solely because he wanted to use Wang Cai to suss out these people. As for Wang Cai's safety, Mu Can couldn't imagine anyone in the Mortal World who could pose a threat to him entering the Immortal Ancient Secret Realm.