They missed out on each other during high school because of a misunderstanding. After graduating from college, they went back to their high school and became teachers. After seven years, he didn’t recognize she was actually that girl. This is a story between a boring and impassive PE teacher and a scheming yet gentle Math teacher. Everything had changed after they met. Could they reignite their long-lost affection for each other again? At the same time, the secret in their high school time also began to be unveiled...