When I started the show based on the preview and the name of the show , I assumed that it would be on the lines of Business Proposal - romance , comedy , little bit of drama and tons of fun but it was nothing of that sort.

I will start with issues

1)first and foremost there was no need of murder mystery in CRASH COURSE IN ROMANCE.
2)the backstory of the killer was so lame that i kept asking myself what were the writers smoking when they came up with this track.
3) they could have given more time to love stories - the older ones and younger ones which totally pissed me .They could have explored so much more with both the generations but no they had to fill in evil moms, unwanted murders and useless investigation.
4) Didn't had to show Moms such vile creatures, instead of bringing comic reliefs they brought in more misery with the plot (in start episodes, they were real funny with their petty efforts for their kids, towards the end they were simply toxic)
5) Why they had to chose Jeon Do-yeon who is almost 10 years older to Jung Kyuong-ho as female lead is beyond me, she looks visibly old and doesn't bring any chemistry to table. She looked odd in every scenes with him , apart from looking older , she looked more of try hard to suit the image of younger person and their romantic scenes had zero charm.she was the only actor who did not suit the character. She looked too old as hae-yi's mom as well and she was supposed to be younger sister of her Mom.
6) seriously they brought in hae-yi's Mom(I mean WTF like we it wasn't already messed enough). other than trying to elevate Nam Haeng-seon to the saint status and trying to fill in to complete 16 episodes, there was no need to bring her in.
7) As if two love stories weren't enough, they squeezed in third love story also in 13/14 episode which obviously was rushed due to no time.
After reading this , people may think why would i continue to watch this show and didn't drop it ,pls allow me to explaing.

The only reason i continued with this show is Jung Kyung-ho who was absolutely fabulous as Choi Chi-yeol. What a fine actor he is , never in the whole of 16 episodes he has gone astray or left his character , he did full justice and finely portrayed the arc from being miserable even though successful to actually being happy. Dude even crammed Maths formulas like a pro, it doesn't look like he is acting when he is teaching , he makes you feel that yes he is the actually the star teacher as he is hailed in the show - plus points for that.
Lastly the last episode was good quality - they closed all the loops nothing left hanging for imagination , this is the most important thing for me in any series I watch. I loathe the shows in which they keep the audience hanging and leave the answer for audience to interpret. Also they gave us going on knees proposal by Choi Chi-yeol which almost made me not angry /forget with the issues. - total swoon worthy it was .
so to complete my review i would say watch it you are fan of Jung Kyung-ho or you have nothing better to watch.