Whose calligraphy is this pair? Please ask the teacher to see whose seal it is!

Signature: Geng Chenchun, good-hearted Li Junyi.

Figure 2 Seal: Book of Daoting Studies (seal)

Figure 3 Seal: Seal Edge (Informal Seal)

Figure 4 Seal: Chen Geng (year, leisure stamp)

The author's surname is Li, whose name is "Daoting" and the word/sign is "Junyi"; Or "Junyi", and the word/number is "Daoting".