Color-magnitude diagrams of Gaia (left) and 2MASS (right) with RSG (red), YSG (yellow), and BSG (blue) candidates overlapping, where the colors are coded from dark (Rank 0) to light (Rank 5) based on the ranks. The RSG branch extends towards fainter magnitudes with a few candidates scattered in the much fainter and redder region in the optical band, which is likely caused by the circumstellar dust envelope. Green contours represent the number density.