After twenty-four years surrounded by love and care, Lulu still couldn't shake her confusion about her origins. Her adoptive parents' affection warmed her heart, but it could not dispel her fixation on the question, "Where did I come from?" An old silver lock engraved with delicate patterns appeared unexpectedly, uncovering a past long buried by time and presenting her with a crucial choice: to submit a blood sample for the database. At first, she hesitated, worried about upsetting her adoptive parents and afraid that her search for her birth family might come to nothing. But after seeing countless families grieve over blood ties that had never been reunited, Lulu finally summoned the courage to offer a drop of her own blood as a key, cross the barrier of time, and search for the family she had been separated from, bringing her birth relatives the hope of reunion.
