Yo-dai was angry at the letter brought by the envoy, but he still sent Sei HAI (One of his Chinese character '世' [pronounced "Sei"] was also used in the real name [李世民] of the second emperor of the Tang Dynasty, Emperor Tang Taizong; therefore it was omitted from his name because it was taboo for people in the ancient China to use any of the characters used in the Emperor's name), a secretary, as the envoy for a return visit in 608.
煬帝はその国書に立腹したが、翌大業2年（608年）、文林郎である裴清（世については太宗（唐朝の二代目皇帝李世民)の諱世民のため避諱された）をその答礼使として派遣した。