First, they are both unhinged. Sometimes their humor is so over the top, but I love that. It's the best medicine to make you laugh. Both have romance but waikiki has more focus on friendship rather than romance, while freaking fairytale focus on the romance between two leads.
They're both so funny and have the same type of humor. Also, they both have romcom as a focus and don't steer to another genre (ex. sudden thriller). I consider them healing drama, where I can just laugh and not think deeply about anything.
They're by the same creator so overall they have the same humor. Their chemistry is also crazy good. Definitely a drama that will brought laugh and joy!