Why didn't Lau stay with Xin? I know something happened that made them drift apart from each other but it's Xin's safety being compromised here. If they suspected that someone was sneaking into Xin's bedroom and tattooed his back without his consent (which is impossible by the way, how the hell did they not suspect that something unnatural was going on?), why didn't they put security detail to watch over Xin for the time being? Or just use the security camera to monitor the bedroom? I'm so confused.
But alas, the art is superb and the story got me hooked, can't wait for the next chapter.