Shen Yuan, with all the self-control five years of pretending to be an impassive and dismissive immortal master gave him, does not do a cartoonishly huge fist-pump about this. He leads Jiang Cheng to one of the lounges, and rummages around in his sleeve until he produces the vape pen. "You just hold it to your lips," he says, "and breathe in." He demonstrates, breathing out a slow cloud and smiling at Jiang Cheng through the haze, and then immediately circulates his qi so he doesn't actually get high. Getting Jiang Cheng to relax is one thing; relaxing with him a completely different one. He holds out the vape pen.