Having participated in the revolution against the Imperial Court in Star Engraving County, and having instigated a rebellion in Xuanzhu County, and even having been abducted by human traffickers, after experiencing so many storms, Le Yu is no longer the naive university student who just walked out of the ivory tower.
He could instantly see that Shang Lingyi's main goal was to find 'Yin'. It must be said that Shang Lingyi's approach was much smarter than his — under the guise of sponsorship, she invited Lou Yinhai, this prominent pillar of the Imperial Academy, to help. Therefore, even if her questions seemed somewhat excessive or strange, Yan Yi could only do his best to answer them.
As for 'Yin' using a radio metal badge for communication, exposure was inevitable — just like how 'Yin' gave Qin Leyin a Heartfelt Connection badge in order to communicate with him. If 'Yin' wished to contact others, they would also receive a Heartfelt Connection badge.