Multiple rows vs Single row with JSON

What is the most optimal way to do this? - In TV Show page I need to get all progress from all episodes in that TV Show - In Homepage I need to get the continue_watching - In Episode I need to get progress of the episode. - Some TV Shows have more than 100 episodes Ex:

USER_ID | SHOW_ID | LAST_SEEN_ID | LAST_SEEN_TIME
10      | 5       | 12           | ---

USER_ID | EPISODE_ID | PROGRESS
10      | 10         | 15
10      | 11         | 20
10      | 12         | 95

OR

USER_ID | SHOW_ID | PROGRESS                     | LAST_SEEN_ID | LAST_SEEN_TIME
10      | 5       | {"10":15, "11":20, "12": 95} | 12           | ---

In PosgreSQL I can get the individual progress with: SELECT progress->'10' as progress... I think that the best method is the first but it will create a lot of rows and this could make DB slower?