Why did Xu Qin get drunk in "My Fireworks on Earth"?

My overall score of human fireworks is 2023 /

Her feelings for Song Yan are hot, but she has no outlet to vent. In fact, uncle and aunt didn't want Song Yan and Xu Qin to reconcile at all, but they still couldn't say it in the end. At this time, Xu Qin was drinking one glass after another, and when she was drunk, she suddenly stood up and left. Meng Yanchen and Xiaoxiao chased after Xu Qin when they knew he was gone, but Xu Qin had already taken a taxi and left by himself. Of course Meng Yanchen knew that Xu Qin was using alcohol to boost his courage, so he called Xiaoxiao and followed him. As he expected, Xu Qin didn't go home at all, and ran directly to Song Yan's house, even Zhai Miao couldn't stop him. Xu Qin directly initiated a drunken madness.

Song Yan finally came back, Xiaoxiao wanted to take Xu Qin home. However, Xu Qin asked where Song Yan had gone on the spot, and when he knew that he was with Zhan Xiaorao, he was even more reluctant. She accused Song Yan of not being good enough for herself, because she liked Song Yan more than Song Yan liked her, and she was completely released.