When I first watched this series, many threads about side characters seemed strange to me. First of all, the story of the two brothers seemed to me shallow and pushed in forcibly. I also did not understand the behavior of characters such as Type and I was not able to explore the relationship between Type and Techno and other older boys in the series. It all made sense and depth to me when I saw the "TharnType" series, which is basically a prequel.

Main couple: Pete and Ae present a simple, sweet and innocent story about first love, first sexual experiences and first steps into adulthood. It's cute and light. It makes watching them a real pleasure.
Second pair: Can and Tin don't get enough time on the screen to show how great their simple and yet deep relationship is, but I know they will have this time in the second season. And I can't wait for it. I absolutely love Can's character, which makes me always laugh. I totally understand why Tin loves him!
Third pair: brothers, as I wrote above, you need to know "TharnType" to really enjoy watching them. Although their story is much darker and heavier in reception, they eventually find their way to the light and it is beautiful.
Fourth pair: Kla and Techno are another cup of tea. This is the story of a big bad wolf and a stupid red hood. Or a wolf in sheep's clothing who completely deceived a silly sheep named Techno. It's a really complicated story, a bit twisted, a little fucked up and not for everyone.

LBC is one of my favorite BL dramas. It is multi-warrant despite apparent simplicity.