Yin Si is the eighth prince, outwardly gentle and amiable. In the story, he encounters Yinzhen and Yinxiang on the palace road and greets them with a smile. He is part of a clique with Yin Tang and Yin E. The narrative hints at deeper political ambitions, but his immediate portrayal is that of a polished, polite brother. He is also mentioned in connection with the scandal involving Ming Yu and Ruoxi, as his consort’s sister is involved. He seems to maintain an even temper on the surface.
