The stories are the same in so many ways.
Both are about CEOs and their dirty plots.
Leads suffer from Amnesia.

Both dramas show childhood friends turned into lovers with so many misunderstandings
Both are set in school days and show the students' family backgrounds and past.
Both have cute soundtrack selections
There is a love triangle in each of them
One has a strong unrequited love

Both dramas are set in College days.
Both dramas revolve around friends and classmates hanging out together ( They eat out together, go on trips, fall in love, breakup, etc)
Both have love triangles and unrequited love
Even the soundtracks are somewhat similar and give off the same vibe
The leads have been through hardships and have been raised in unfunctional families

Both are supernatural dramas
MLs are fantasy creatures with a dooming past and an impending future
FLs are simple humans
Magic is involved in both
A doomed romance between the leads

Both are supernatural and fantasy dramas
One of the leads is a supernatural creature doomed to live a long life
There is someone behind the magical lives that guides them through
Lots of magic in both :)

Both are fantasy dramas with the ML being a supernatural creature
The FLs are simple girls
Both have magic involved

Both are Fantasy dramas
One is a supernatural creature, and the other one a normal human being
Cold and rich MLs
Magic driven dramas

The plots and scenarios are really different, yet it shows how painful unrequited love can be
Both leads are childhood friends

Contract relationships
The leads hate each other at first, but start to develop feelings
Crazy love is more of a dark comedy, while BTIMFL is more dramatic

Love-hate relationships
MLs are rich and successful CEOs
FLs are simple girls
Contracts involving fake relationships

Enemies turned lovers
The leads pretend to be Engaged with a contract
Jealous and miserable Exes show up in both

Love-hate relationships turned into deep romances
MLs are both Rich and successful CEOs
Secret Garden is fantasy-themed, while Crazy love is more dramatic and realistic