Jiang Cheng is... struggling, fam. Religion??? Don't know her. He's doing his best to fumble through by also pretending to be a taciturn idiot, so he's doing his best Lan Wangji impression as he declines anything that sounds remotely like fun and keeps his thoughts to himself. Internally, he is screaming. At all times, he is screaming. He may take this out on the network when he reaches the end of his rope. (It's a very short rope.)
Due to his internal panicking and inability to stay in character for long stretches of time, he will be largely keeping to himself/trying to maintain a low profile while other people takes care of things. He will be following closely in Lan Wangji's shadow as he's the only person on this team Jiang Cheng knows outside of Xiao Xingchen, and he's at least worked together with Wangji before. And he loves to make his problem Wangji's problems, let's be real. (He will check on Xiao Xingchen, of course, but be awkward about it, and probably blurt out something unfortunate at the earliest opportunity.)
When it comes to the masquerade ball, he will absolutely get poisoned for no other reason than he refuses to be left out of anything Lan Wangji is doing, and that includes dying horribly of poison. He will also ride Wangji's coattails for all of the subsequent fallout, and possibly let everyone Wangji doesn't want to know that they're poisoned that they are 1000% definitely poisoned.
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Due to his internal panicking and inability to stay in character for long stretches of time, he will be largely keeping to himself/trying to maintain a low profile while other people takes care of things. He will be following closely in Lan Wangji's shadow as he's the only person on this team Jiang Cheng knows outside of Xiao Xingchen, and he's at least worked together with Wangji before. And he loves to make his problem Wangji's problems, let's be real. (He will check on Xiao Xingchen, of course, but be awkward about it, and probably blurt out something unfortunate at the earliest opportunity.)
When it comes to the masquerade ball, he will absolutely get poisoned for no other reason than he refuses to be left out of anything Lan Wangji is doing, and that includes dying horribly of poison. He will also ride Wangji's coattails for all of the subsequent fallout, and possibly let everyone Wangji doesn't want to know that they're poisoned that they are 1000% definitely poisoned.