Not only were Han Yu and his wife Shangguan Wuyou surprised by Su Wenyue's sudden pivotal role at the crucial moment, after all, Su Wenyue had never shown any inclination toward scholarship, but even Yiyang Prefecture's Four Great Talents hadn't expected that Su Wenyue would have an answer, especially since the riddle wasn't posed by them, and they didn't know the solution either.
When they saw the two characters Su Wenyue wrote on the paper, everyone was even more confused. They recognized the characters, but they really couldn't understand how they were related to the riddle, let alone what the two characters meant when connected.
Su Wenyue knew this was the answer, but to be honest, she didn't really understand how these two characters constituted the solution. However, she desperately wanted that colorful exquisite lamp, so she wrote out the two characters from her memory.