so far i found my kind of drama where protective brothers not let her sister to date anyone in matter to not hurt by any guy such fun to watch their protectiveness (otherwise asian drama are disgusted brother sister relation by making them couple in name of not blood related ) and this quadruplets siblings are perfect example of what brother sister should be like .

yes there is flaw in execution few things but to execute well it need time/episode more cause it have 9 epi instead of that it manage great to portray the story in compromise in few scenes and rush it but thats ok overall sibling brother-sister-hood and main couple romance cover all the flaw

characters:-

NAM
she is doctor only dauther of their parents and sister of 3 brothers who all treat her like princess their world goes around her some time it frustrated she don't get space from her brother but contrary she know her brothers well whatever her brothers do its for her safety that they loved most

PARENTS
they are so supportive to their children and same time like other parents care for them

FAI
most impulsive in 3 brothers that make him some time idiot which i liked it

note:-
NAM and PRINCE
character can be explained well but they rushed things

suggestion:-
ya there is some flaw but it can be ignorable overall package is full of comedy and romance i definitely suggest this its good drama has only 9 epi not so burden

great romcom drama i enjoyed it alot :)