Differential reddening corrected CMD of NGC 752. The triangle and square symbols represent the BSS of NGC 752 reported by Li et al. (2023) and an SSG candidate, respectively, while the dots denote cluster member stars. The solid red line represents the best-fitting isochrone, with parameters provided by Li et al. (2023). The red dashed line corresponds to the ZAMS. The color bar indicates the membership probability.