An anonymous letter exposed the bullying and cover-up of teachers in the senior year of high school, and the whole class fell into suspicion. Only the silent science genius Lin Zhao and the unruly liberal arts number one Lu Yan were pushed to the center of the storm. They questioned each other, but blocked each other's malice time and time again in the dark. Monitor Su Rui's concealment, transfer student Chen Jin's revenge, school doctor Zhou Yu'an's silence, sister Han Zhi's truth - every face hides a key. When the handwriting of the letter points to the graduation ceremony, they must choose a tomorrow where they can go on together between exposure and destruction.
