He thought he had it made when he transmigrated with a powerful system. But it turned out that to level up his system, he had to get beat up by other people. Just as he was resigned to accept the beatings, a young girl appeared and brashly asked him to become her apprentice. Tempted by the pretty loli, he accepted her offer. Hey, she'll grow up some day. But he didn't know she would grow up quite so quickly...