The Healing Priest of the Sun is a Manga/Manhwa/Manhua in (English/Raw) language, Action series, english chapters have been translated and you can read them here.
The Summary is
[From the author of Return of the Frozen Player:]
“The reason why he does quests like that isn’t because he’s kind but because he’s a sucker.”
Kai looked back at the people talking behind him from a distance.
‘I’m a sucker?! Is it really wrong for me to help those in need?’
[You helped an NPC in trouble.]
[Your kindness stat has increased by 1.]
You’re rewarded when you do good deeds?
A never-before-seen Priest on a whole ‘nother level has appeared!!