Okay, okay, so. What I have gathered—and I can be totally wrong here—is that the first time she was discovered because of something on her neck. Or maybe something she didn't have, like a mole or birthmark. Guess what she's wearing in this chapter? A neckband. If Ren comes over in the next chapter while she is still wearing that—and I'm willing to bet she is wearing that because of him—he wouldn't be able to figure it out this time. Boom.