There are several recommendations for physical novels featuring male protagonists secretly in love with female protagonists. Some of these recommendations include "理查德外賣" by 冬減西, "陌陌謙行" by 錦紫蘇, "續(xù)杯咖啡" by 無處可逃, and "沒有人像你" by 歲見. These novels explore themes of unrequited love, perseverance, and the eventual blossoming of love. However, it is important to note that the specific novels mentioned may not all be readily available in physical book format.