After the death of the young girl Yun Xiang's father, following his last wish, she went to rely on her father's old comrade-in-arms Cheng Xiao, and lived in the Cheng family home. Eighteen-year-old compound youth Cheng Che initially felt full of resistance toward the "younger sister" who suddenly barged in, setting rules to draw clear boundaries everywhere. Under the same roof, campus daily life, math competitions, music festivals, alley evening breezes, and dessert fireworks constantly tugged at the two people's emotions. Yun Xiang was sensible and resilient, slowly melting Cheng Che's prejudice. The prickly, spoiled boy and the gentle, clever girl quietly hid the throbbing youth romance amidst the passionate midsummer.