when will the uncle story come? isaacs uncle or what is chasing him ryt?

Spoiler:
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Cole (Issac's stepfather+the one chasing him) has one of his men capture Issac at the end of S1 and makes his appearance in ch 2 of S2. Here's the raws in case you wanna take a look:
https://newtoki81.com/webtoon/907681/디어-벤자민-Dear-Benjamin?toon=BL%2FGL
https://lectortmo.com/library/manhwa/48100/querido-benjamin

which chap is the s1 end

ch 22

great!!