His Moonlight Heiress

After being abandoned by her stepmother as a child, Kathryn returns to the Palmer family twenty years later. She first saves a wounded stranger by a lake and takes a red gemstone from him. She then forces her father to publicly acknowledge her in exchange for donating her rare blood to save the stepsister who replaced her. The stranger she saved turns out to be Evans, a powerful CEO who has been searching for her, his only clue a crescent moon tattoo on her collarbone — a tattoo she keeps hidden with makeup.