Hormones

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.

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.

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

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

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.

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.

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.

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.

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

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

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.

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.

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

The students return from summer break. The kids, teachers and even parents are all talking about a steamy high school TV drama called "Love Struck."

Thee is hurt when he finds out Phu and Toei are together. Pop's younger sister is a big fan of See Scape, and she seems to really like Tar.

Now that he has a new girlfriend, Tar is walking on air. Toei feels uncomfortable when Mr. Pin, the handsome computer teacher, gives her attention.

Win re-enrolls in school, and he has a lot of apologies to make. Dao feels hurt when she sees Din, the boy she dated last year, with another girl.

Phu begs Toei to forgive him for insisting she stop hanging out with Tar. Later, Phu meets a bartender who introduces him to people he can relate to.

Win went to New York to better himself, but while there, he struggled to keep his demons at bay -- especially after meeting the hard-partying Jane.

Although worried, Kwan's parents let her go on a trip to the beach with her friends. Mhog builds up the courage to ask Kwan to be his girlfriend.

Mhog doesn't know how to feel when his father tells him he has a new female friend. Win continues to struggle with his addiction.

Someone is impersonating Sprite online and ruining her reputation. Sprite doesn't really care -- until things start to get out of hand.

Unhappy and bored, Oil comes to life when she pretends to be a popular classmate online. She needs to stop, but she doesn't know how.

The school is buzzing with Valentine's Day preparations. Tar cares about his girlfriend, but he still feels a strong connection to Toei.

Phai gets a major wake-up call when a girl he hooked up with tells him she's pregnant.

Dao organizes an event where students give each other year-end messages on heart-shaped paper. Phu can't bring himself to give his message to Thee.

Another school year begins. The girl who introduced Win to drugs in America transfers into the school, and she's shocked by how strict her teacher is.

Dao and Koi finally talk things out. Dao wants their close friendship back, but Koi wants more and is hurt that her feelings aren't returned.

Zomzom is upset when her father's friend John brings his daughter and moves in with them. At school, she pretends not to know John's daughter.

An older boy at school named Sun has a crush on Mali, and the feeling seems to be mutual. Jane considers becoming a drum major in the school band.

Jane joins the band as drum major, but she has trouble with teamwork. Later, she sees Win out at a club for the first time since New York.

A rift grows within the school council over the Sports Day budget. Koi builds up the courage to tell her father that she likes girls.

Jelly promises to return the money she misspent, but Boss doesn't trust her. The school council works deep into the night to prepare for Sports Day.

Jane returns to school and immediately gets into an altercation with her teacher. First is always joking around, but things aren't good at home.

On the heels of Non's departure, Boss also quits the student council. At the mall, Sun gets a surprising offer from an attractive older woman.

With Sun distracted, the other members of See Scape ask Pang to sing for them. Pala is living with HIV, which is why his grandma is so overprotective.

Oil has a seizure at school and gets jealous when she finds out that Pang and First are texting each other. Dao reaffirms her feelings for Koi.

After what Pala's grandma said to her, Zomzom keeps rejecting Pala's advances. Pang asks Tar if he was behind the rumor about her.

All of Oil's lies come crashing down around her. With nowhere else to turn, she writes a heart-wrenching, confessional post on Facebook.