He stated in his Weibo that their company had initially tried searching for someone within their circle of voice actors regarding the matters of dubbing for Qing Siyu. There were several backup candidates as well, but within the Internet voice-acting community, female CVs were far less well-known than male CVs. In a nutshell, the fans in the mixed community were boiled down to mostly younger girls. Every one of them liked that male idol type of voice, but they were not particularly enthusiastic about voice actors of the same sex.
For the sake of publicity, they had to look for someone who already had a decent number of fans. Coincidentally, Yun Linling was his friend, and they discovered that Silent Words was his girlfriend. She already had a fan base of her own, and they had met her in person before. They felt that it really fit the image of Qing Siyu in the game after hearing her voice.