How to repair the corrupted image below using opencv, python, numpy and necessary libraries

[Casm]

https://imgur.com/mW6ed

import cv2

damaged_image = cv2.imread("Corrupted.png")
mask = cv2.imread("mask.png", 0)

output = cv2.inpaint(damaged_image, mask, 1, cv2.INPAINT_TELEA)
cv2.imshow('test', output)
cv2.waitKey(0)
cv2.destroyAllWindows()

I couldn't generate mask with python, i have drawn the mask by using Paint as you can see it is not perfect.

https://imgur.com/kIPHP

After this code i get this output:

https://imgur.com/HKsOf

the repaired image should look similar to this picture:

https://imgur.com/910cq