Youth Online Watching_New Vision Broadband Cinema

At the end of winter and beginning of spring when plum blossoms bloom quietly, Jisoo (Kim Rae-won), a senior high school student about to take the college entrance exam, was smitten by the beauty of a girl named Sarah (Yoon Ji-hye) right after transferring to a new school in Seoul. He soon fell deeply in love with her and couldn't extricate himself. Under the allure of his mature yet somewhat self-righteous classmate, Charo, an unsuspecting Jisoo crossed the line too early as they indulged in physical intimacy, and they tasted the forbidden fruit.

Instead of deepening their feelings, this act weighed heavily on them psychologically. Jisoo felt panic and unease, deliberately avoiding Charo. However, Charo remained fixated and devoted to Jisoo, whose aloofness caused her immense pain. Under the immense emotional pressure, Charo chose to commit suicide by jumping from a building, ending her young life. After losing Charo, Jisoo began to develop aversions towards love, started to willingly fall into depravity, indulging himself more and more, and spent his days seeking only physical satisfaction.

Jisoo's close friend from the same class... (The sentence seems incomplete in the original text, so additional context might be needed for full translation.)