Choi Chi Yeol is a famous mathematics teacher at a prestigious The Pride academy. He doesn't have time nor interest in women or anything else beside his work. He has trouble sleeping and barely eats, and when he does eat he often throws up. One day, his assistant brings him a bento lunch from a place where Nam Haeng Seon works. Choi Chi Yeol reluctant at first, and without an appetite, he decides to try and eat. To his surprise, he finds is delicious and nostalgic, and it sits well with his stomach. What he doesn't know, is that owner of that place is Nam Haeng Seon who chased him not too long ago when he stole her brother's phone thinking he was trying to get a gossip photo of him.