I mostly just watched the BL side story because the main one didn't hold my attention consistantly. I've listed time stamps for Talay and Sky's story below. (Talay is the brother of the main female lead.)

Sky and Talay were acted well and very naturally (8/10), and though their story was simple, it was enjoyable to watch. I would recommend it for BL fans in the mood for two highschoolers finding their safe space in each other and catching feelings (though at different paces).

I watched the full episodes (7 total) on the One31 YouTube channel (in the USA in January 2024).

I've noted Talay/Sky scenes with them individually as well as together to get their full stories.
Format example: their first scene starts at 26min & 20sec into the episode (-and goes to 32min & 10sec in).
Ep 1: 26.20 (-32.10), 35.10 (-38.40)
Ep 2: 19.15 (-22), 38.50 (-44.50), 45.45 (-47.30)
Ep 3: 4.20 (-5.30), 28.35 (-36.05)
Ep 4: 11.35 (-25.05), 56.30 (-57.40)
Ep 5: 2.20 (-23), 37.20 (-39.35), 48.30 (-50.30), 54.30 (-58.35)
Ep 6: 13.30 (-14.15), 21.15 (-23), 28.40 (-31.15)
Ep 7: 3 months later 1.10 (-7), 16.50 (-23), 36.20 (-39.10), 40.50 (-48.20), 3 years later 54.25 (-55.20)