Je-hyung who is left alone after his mother's death quits school and starts to work. On his way home he meets a girl who doesn't seem to have any place to go and brings her to his house. She disappears next morning, and three years later they meet again.

[From JanimeS]:

Dohun Yu has just left England to persue his father in Seol. Out of the blue his money and passport are stolen! Whats worse is that instead of his own luggage he accidentally took his sister's! After days of starvation with only a single bun to fill his stomach an advertisement offering room, board, and pay falls right into his lap! The thing is...the ad is looking for girls.

Jung Euimoon and Eun Myroyung are both members of the second Biology Club, which has been downgraded to the oldest facilities in the school to make room for the new Biology Club. Jung Euimoon uses Bunsen burners to cook his breakfast and routinely camps out at the Biology Club room to get away from his numerous siblings. Eun is a loner and reads tarot cards - which always foretell unhappy auguries - to amuse herself. They each think the other is strange. These two seem to be opposites, but they have more in common than they think. Who knows what the future holds in store for them. (Source: Entropy)