Three Encounters, Falling Thrice in Deep Love (3)

With his back still facing Lu Bancheng, Gu Yusheng frowned when he heard "gambling debt."

"Gambling debt?"

He had often been suspicious about Qin Zhi'ai's age. She'd always seemed older than her peer graduates. He asked Lu Bancheng to check her profile, where they noticed that she had a gap due to her mother's illness. 

How come Lu Bancheng is saying it was because her father owed a gambling debt?

Lu Bancheng had no idea what was on Gu Yusheng's mind. He sighed and murmured quietly, "Bro Sheng, do you know I had thought the love between Haozi and Nuannuan was the greatest love I would ever witness? Even when I was overseas for high school and didn't see you guys that much, it was always the greatest love I'd ever seen. I've watched them for years, and I've seen how Haozi has been exceptionally good to Nuannuan. I was touched by his love much more deeply than most men."