Original: สายรหัสเทวดา
First-year students join the elite ‘Perfect 10 Liners’ mentorship circle, where new bonds, secret crushes, and unexpected love stories unfold.
As Arm enters university, he is introduced to his peer mentor group, the Perfect 10 Liners. He unintentionally gets off on the wrong foot with his senior, Arc, after posting his photo on the Engineer Cute Boy page.
Arc makes an attempt to spend more time with Arm, but his teasing attitude leaves Arm unsure of his intentions.
Arc shows a different side of himself after the car accident. As Arm's pinning ceremony approaches, Arc encourages Arm to make more of an effort to get to know him more.
Arc and Arm take turns caring for each other as Arc gets injured playing soccer and Arm finds himself in the middle of a bar fight.
Arc and Arm take a trip together to get his bracelet from one of the founding member of his mentorship group.
Arc confesses his feelings but Arm asks for more time to reflect on how he feels. However, Arm starts to feel possessive when Arc's buddy Brink makes an appearance.
Arc finds himself competing with Arm's new "buddy", Tongfah, who appears to be endlessly charming and talented.
Arc and Arm say goodbye to their buddies. Arc gifts Arm his engineering jacket, but Arm loses it after wearing it for just one day.
As the new school year starts, the Perfect 10 Liners meet their newest mentee, Yotha. Yotha's brother Faifa makes fast friends with fellow freshmen, Gun.
Gun and Yotha become roommates after Gun's sleeping habits make his previous roommate totally sleep deprived.
Gun learns the reason Yotha spends many late nights at the bar as the two get to know each other more
Yotha and Gun select their buddies from among their peers. Gun's friends begin to question the relationship between him and Yotha.
Even though Yotha and Gun have gotten closer, there are still parts of Yotha that Gun doesn't truly know or understand. After witnessing a fight Yotha is in and an earlier incident between Wa and Yotha, Gun chooses chooses to move in with Fai.
Yotha and Gun return from their trip after receiving Yotha's bracelet from Tawan. Yotha asks Gun for more time to determine his feelings.
Gun and Yotha learn to face their fears together.
Yotha and Gun announce their relationship to their friends. Yotha has an opportunity to reconnect with his mother.
The Perfect 10 gang welcome their newest member, Wine. But with Yotha distracted from his mentorship duties, Faifa steps in and begins to get to know Wine better.
Wine has been wrestling with a secret and the heartache following his breakup with Toey. However, after a night out with the Perfect 10 gang, emotions and the secret Wine has been holding in begins to overflow.
Wine is relieved when he learns that Toey still wants to be friends after their breakup, but Faifa seems concerned when he learns that Wine's crush Tor is also interested in men.
Wine and Fai have been spending time together, with Fai "teaching" Wine about love and checking items off in their notebook. This was meant for Wine to use to gain P'Tor's affection. But, little by little, Fai start to understand what "special" means, and that for him, it might be Wine. Arc, Arm, Yotha and Gun are worried about Fai. They know about his inability to say no, his kindness and the way he treats everyone the same. They don't know if Fai really knows how to love.
Wine tries to figure out if he truly is special in Faifah's eyes. Jay and Ben have noticed that Wine is happier with Faifah's presence in Wine's life and that Faifah goes out of his way to spend time with Wine. Finally, Wine admits to them that he has feelings for Faifah and that they've kissed. Yotha, Gun, Arc and Arm are not confident that Faifah will not mess this up, so they try and figure out how they can help his budding relationship along.
Tor and Wine are reunited at the festival event on campus, but Wine's feelings have shifted since they last met.
Wine and Faifa are officially dating.
The Perfect 10 Liners gang goes on a camping trip as a friend prepares for a special proposal.
