from einey,

Love can sometimes be the reason why both people meet the right one but at the wrong time. But for Aeri, to love is something that she never wanted until she met Yizhuo, at the moment that nothing has ever good that's happened, until her. Yizhuo once drew a line that upon meeting Aeri, she somehow crossed that line.

But as for some circumstances, the invisible line is the only way for them to realise what's worth of waiting.