My Homeroom Teacher Is My Childhood Friend

The temporary homeroom teacher assigned to her class turned out to be Han Xincheng, her childhood friend. Gu Xi hurriedly buried her head in a pile of books and gritted her teeth. "What is that bastard doing here to stir up trouble again?!"

Notes: 1. They're seven years apart and have a mutual crush. 2. A feisty, sharp-tongued top student who won't let anyone take advantage of her + X + a ridiculously flirtatious, warmhearted schemer. 3. Studying comes first; everything else comes second. 4. Updated daily without fail.