Takes place before the events of "Kiss: The Series''.

They focused it on Sandee's and Sanrak's older sisters. We also find out in this series how Kao's and Pete's relationship came to be while also seeing how June, Sandee, Thada, Pete, and Kao all became friends.

summary:
A disparate group of five university students unite together as friends. Two of the boys in the group, bad boy Pete and intelligent sensitive Kao, don't tell the others that they know each other better than they are letting on. They hate each other, after a series of violent incidents that has set them at odds. One of these incidents ended up with them accidentally kissing. While it's clear that Kao wants to talk about his confused feelings for Pete after the kiss, Pete pushes him away angrily, leading to more violence. Their friends eventually realise that something is wrong between Pete and Kao, leading Pete to lash out at Kao even more violently and destroy the group of friends. When Sun, the brother of one of Kao's friends Rain, starts showing interest in Kao, Pete begins to understand his true feelings hidden under his jealousy.

note: this is NOT entirely a BL. 

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officially available
on youtube, GMMTV.

source;
aworldofboyslovebl.blogspot