Scarred Gem - Jeonglyeongseog-ui Guae

Due to an unforeseen accident, our protagonist ruins his university entrance exams. As our protagonist makes up his mind to re-take the entrance exams, a mysterious girl appears and hands him a broken pendant while speaking in an unknown language. Although suspicious, he brings the pendant home with him. This awakens the spirit in the pendant and with her support, our protagonist has to find his significant other. (... what happened to re-taking the entrance exams?)