She wanted to know whether Leng Shaoting would be displeased. If he didn't mind it, she would agree to play the game with Qi Tianlin.
Although it was just a game, Qi Tianlin had an ID which looked to be a couple's name with hers. Therefore, Gu Ning thought it was necessary for her to ask for Leng Shaoting's opinions.
Leng Shaoting didn't give her a reply right away, so Gu Ning thought that he must be busy now.
Actually, Leng Shaoting already read her message, but he didn't immediately reply to Gu Ning because he was in a bad mood. If Qi Tianlin didn't have an ID which looked to be a couple's name with Gu Ning's, he wouldn't mind, but Qi Tianlin did.
He knew that Qi Tianlin liked Gu Ning so it was a challenge to his ability. After thinking for a while, Leng Shaoting logged in the game and changed his ID to be "the Husband of the Future Queen".
It might seem childlike, but he accepted the challenge.