A former police officer from the Trace Identification Division failed to crack the electronic lockbox left by his mentor three years ago, which indirectly led to the loss of key exhibits and the "accidental" death of his mentor. He has since resigned and opened an old object restoration studio to hide his whereabouts. He is proficient in the structure of mechanical and electronic combination locks, and is as sensitive to numerical symbols as instinct. His fingertips are always covered with thin calluses left by the repair of the lock cylinder. His personality is tolerant and reserved, and his sharpness is only revealed when he dismantles the code. For him, the password is not only the shackles of guilt that cannot be released, but also the only key to pursuing the truth.
