Xiao Yize had conducted the paternity test without informing his parents.
After Tong Wan woke up, her desire to find her daughter was overwhelming. Once her emotions stabilized, she made multiple trips to Liang City and Jin City. Each time she identified a potential match, she conducted a paternity test, but each attempt ended in disappointment.
Xiao Yize kept these results from her and continued with the tests in secret.
Despite Gu Jin's analysis suggesting a high likelihood that Gu Yang was his biological sister, Xiao Yize chose not to inform Tong Wan until he was completely certain. The waiting period was incredibly torturous.
When he received confirmation from Gu Jin that Gu Yang and Tong Rao were related by blood, Xiao Yize was even more excited and eagerly anticipated the final results.