I have just visit a mechanic at Safora care off my cousin. That mechanic told he will open head and check line, then he will further update. Moreover, he said this is common problem of cultus. If head will be repaired it will cost around 15, if kabuli then 28K.
This video was of morning then I took car to mechanic after inserting oil, which reduced sound substanially. Had it been sound of connecting rod, may be it wont reduced with oil