zhuīgēnxúndǐ
ㄓㄨㄟ ㄍㄣ ㄒㄩㄣˊ ㄉㄧˇ
Simplified 追根寻底
Taivo → Settings → Partner inbox → Make the link. It stays in this browser.
Keep 追根尋底 and it comes back until you know it.