[Spoilers ahead] The drama started off well with a compelling story and amazing acting from the actors. A hardworking servant (ML) who simply follows conglomerate family orders without questioning them.

In a turn of event, murder attempt was made against the ML who went to withdraw money from foreign account. that is when the fantasy kicked in and the same employee(ML) was born as the "Youngest Son of the Conglomerate".

In an attempt to take revenge for his death ML decided to take over("buy") the Sunyang Group and punish whoever tried to murder him.

The Story progressed well until the 15th episode. But in the Last episode everything changed. The Fantasy element vanished into thin air. ML wakes up as an same old, hardworking employee who blindly follows orders and decides to fight for justice.

A number of loopholes exist in the story.

1. The money was donated to the public before Do Jun died. Then why was the money still available for the ML to withdraw as an employee of Sonyoung?
2. Was ML just imagining being the youngest grandson of a conglomerate? So where is fantasy?
3. "Survivor of car accident" is more believable than "survivor of head shots and falling off cliffs to sea". (is that was the Fantasy? not sure ?)

Pros:

+ Amazing cinematography and acting.
+ The drama reminds many of significant moments in history such as Korea's football victory, Y2K, the terrorist attack on the US, and the incident involving the IMF.
+ Except for the last episode, good story and execution.
+ Do Jun and His Grandfather Duo was Great.
+ Grandfather's acting was top notch and some scenes were emotional.

Cons
- The romance was not well suited to the storyline.
- FL was boring and sometimes annoying.
- The ending was not satisfactory.
- Title "Reborn Rich" didn't make any sense after completing drama.