
In the novel Claude tries to kill athy at volume 92 chapter 65, and then remembers it at volume 124 chapter 34. Keep in mind that each volume has more than 30+ chapters even if it's relatively short.
The chapter where athy uses Lucas's powers to go to town and gets noticed by ijekiel (chapter 41 in the webtoon) is volume 73 chapter 18. Keeping that in mind, volume 92 is chapter 53 in the webtoon. for each 19-20 volumes of the novel, it produces around 12 chapters. So if it follows that format, it'll be in the next 3-6 chapter when Claude remembers athy. But that's just a guess so don't rely too much on it
so uh here..
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Lucas is gonna appear next chapter. It's at athy's 15th birthday that Claude finally remembers athy (thanks to Lucas who made it happen, gave it to athy as as the best present for her birthday). It took about a year of Claude to remember athy and it happened like this:
Claude called for athy, athy was still scared and unsure about seeing Claude bc she knows her presence have negative affect on him. She noticed how his eyes had that glow again, and she called him daddy but still unsure. She was crying, Claude held her face and told her to stop or she'll look ugly. Athy cried even more and hugged him and Claude replies with "you got heavier."