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WHYYYY IS IT NOT COMING BACK UNTIL AUGUST GAHHHHH. Anyways major spoilers for the raws ahead:
The way the author hinted towards everything with Lian and the puzzle was insane not gonna lie (referring chapter where she was asking for a puzzle that was hard enough where you can't see the big picture until all of the pieces together). Basically in the last chapter of the raws, she puts together a puzzle made of entirely white pieces, but then pours ink on it to make the form of the tattoo on Xin's body. She's insane but I like that about her (≧∀≦)
The completed tattoo is basically the dragon with 3 heads surrounded by the 5 emblems of the collateral lines, except one of them is on fire, which is likely the 2nd collateral line which got extinguished centuries ago. It looks like the fire is also burning the dragon in the tattoo, and also part of the head family (which is symbolized with the oleander symbol in the middle of the tattoo). I guess that means that whoever wants the tattoo to be done thinks that the extinguishing of the 2nd collateral line centuries ago is what is causing the failure of the head family in the present.
I really don't know how Lau is going to handle all of this because he looks like he got his soul ripped out of him. He looks like he aged 30 years, Xin abandoning him must've done a number on him. August better come fast, I can't wait.