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Malcolm created a topic of Backlight

i saw in chapter 4 and chapter 20 about the flashback to when yeongwoon saw what looks like seo in kissing someone who looks like hae yool (that's why he said he seems to be still looking for someone that looks like that person he kissed in a room when he saw seo in being fubu with hae yool, AND ALSO smh, why would the author make jaewon and that unknown person yet-to-be-confirmed that seo in kissed look so similar to each other? dont tell me that's his brother LMAO impossible) so, going back, the flashback is both yeong woon's pov but why in ch4 the black haired dude that's supposed to be seo in back in their youth has the mole in his right when it's supposed to be in his left? LOL it adds more to my confusion or is it just the author's silly mistake?