E1 - Testosterone

Aired: May 25, 2013

It's the start of a new school year. Popular student Kwan becomes class president, while bad boy Win challenges the school rules in a big way.

E2 - Dopamine

Aired: June 01, 2013

After playing guitar in one of Win's videos, Tar gets the chance to play with See Scape, the most popular rock band at school.

E3 - Endorphin

Aired: June 08, 2013

Kwan and Win are both chosen to represent their grade in the Teacher's Day ceremony. Sprite's flirtatious ways get her in trouble.

E4 - Serotonin

Aired: June 15, 2013

Phai loses his friends when he starts dating Sprite. The girls at school gossip about Tar and Toei. Mhog keeps neglecting his girlfriend.

E5 - Estrogen

Aired: June 22, 2013

Toei walks into her classroom to find the word "slut" scrawled on her desk. Tar wants to reach out to her, but things are still awkward between them.

E6 - Dopamine

Aired: June 29, 2013

Everyone is gossiping about Toei's run-in with the older girls. Thee and Tar get jealous when Toei starts hanging out with her ex-boyfriend again.

E7 - Adrenaline

Aired: July 06, 2013

A monk tells Phai that he's heading for a fatal destiny, but he can't stop getting into fights. He's also increasingly jealous of his girlfriend.

E8 - Progesterone

Aired: July 13, 2013

Although worried at first, Dao's mother ends up being impressed with Din. So much so that she asks Dao to invite him over for dinner.

E9 - Cortisol

Aired: July 20, 2013

Through Win's manipulations, Kwan finds out that her father has a secret son. Sprite struggles with her "easy" reputation.

E10 - Testosterone & Estrogen

Aired: July 27, 2013

Kwan gets caught cheating on the chemistry exam, and the news spreads like wildfire -- along with rumors about her parents. Win feels responsible.

E11 - Oxytocin

Aired: August 03, 2013

Summer break begins. Win takes his frustrations out by sleeping with girls at the club. Kwan meets her father's family. Sprite's baby sister is born.

E12 - Growth Hormone

Aired: August 10, 2013

The students return to school. See Scape is performing at the Big Mountain music festival and Tar can't hide his excitement. Phu apologizes to Thee.

E13 - Hormones

Aired: August 17, 2013

The two-day Big Mountain festival begins. Everyone's there, including Dao, who's lied to her mother about where she's going.