Why did the Korean movie "The Intern" fail?

I enjoyed the American movie "The Intern" quietly and well..
But the Korean "Intern"... even with 8 billion won invested...
Reasons why it failed:

1. The director was too much of a novice.
   2. The cinematographer was also an issue.
2. The location scouting director was also an issue.
3. Casting error for the female lead, and the casting for the female lead's husband was also an error.
   It would have been better if they had used Seo Hyun-jin.
4. Sound director error..