He is the ace with a 100% mission rate in the Black Organization, and was given the code name PORTO when he was twelve years old. He was a young boy who stopped at the Beluga Whale Area of ​​the Rice Flower Aquarium. When he was fifteen years old, he met the people who changed him. Crawling in the darkness...

Many years later, Chi Ye Tan blocked Gu Han in the office and asked him, "Do you still remember who I am?"

Gu Han was still as gentle as before, and smiled and said, "I remember."

Chi Ye Tan hated the fact that Gu Han was gentle to everyone, and asked with gritted teeth, "Gu Han, do you care?"

Gu Han said softly, "Yes..."