gěnggěngyúhuái
ㄍㄥˇ ㄍㄥˇ ㄩˊ ㄏㄨㄞˊ
Simplified 耿耿于怀
Taivo → Settings → Partner inbox → Make the link. It stays in this browser.
Keep 耿耿於懷 and it comes back until you know it.