Both have a person that can see dead people. Both have Funny and Scary Ghost characters.
Master's Sun is far superior. The writing, acting, and chemistry is all 10 times better. It is a drama you will want to watch more than once.
Bring It On Ghost has much more one dimensional characters and a predictable storyline. It does have a couple truly funny character actors playing side characters though. The 2 guys in the ghosthunting club, the Shaman, and her ghost friend are all hilarious. It is unlikely to go on a rewatch list but it will be good for a laugh the first time through.

Both are Great Romantic comedies with a little more than a hint of supernatural.
Both have leading male characters that are Famous/Rich and calculating/rational types. Due to a trauma in their youth, both have trust issues and push people away before they get attached.
Both have wacky female leads who have supernatural reasons to stay by the leading man's side long enough for him to fall for her.

Eat Drink Man Woman is an older Taiwanese movie and Let's Eat is a Korean Drama, but they both have romance and Food.

Beautiful Gong Shim seems to be comedy/romance with some drama and Can You hear my Heart is drama/romance with some comedy. While Drama/romance with comedy is quite different from Comedy Romance with some drama, but I think you will find both dramas romantic storyline satisfying.
What they have in common is the actor Nam Goong Min playing a lead role that is wrapped in mystery pertaining to his childhood/parents/identity.

Both are Romantic Comedies with drama.
Both star Seo Hyun Jin. The characters she plays are similar in that they have some insecurities based on something that happened in her school days.
In both, the male lead / possible love interest is her next door neighbor and he owes her a debt for having wronged her. Due to this debt, he ends up spending time with her/being kind to her. Naturally she develops a crush.
The unique part of Another Miss Oh(Oh Hae Young Again on Viki / Another Oh Hae Young on Dramafever) are the psychic visions that the leading man only has about Seo Hyun Jin's character.
The unique part of Let's Eat is the FOOD porn.
Both are really fun Romantic comedies.

I love the fun and interesting relationships between the in-laws in Five Children and the Potential in-laws in Wonderful Days. Both are Family dramas. Both follow the adorable and sometimes funny budding romances of the other family members. Both portray single parents and how they and their children deal with meeting their new love interest.

Both Signal and Pride and Prejudice have a lead who went into law enforcement (cop/prosecutor)to find the truth/get justice for a family member that was murdered/falsely accused. Both dramas have leads that tackle cases as part of a close knit investigative unit. The cases seem to be unrelated but are in fact all related to a greater conspiracy connected to the death of the leads family member.
There are dirty cops/corrupt prosecutors in both. Great chemistry between the younger and older generations in the workplace.

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Both Fated To Love You and Finding Mr Destiny have an element of Fate bringing the couples together.

Love the second leads in both of these dramas. It is for different reasons but both of the leading ladies have a ruddy unattractive appearance. Both dramas follow the usual Rom/Com formula (leading man is successful and handsome/leading lady is hardworking and has a good heart). In both dramas the leading man is drawn to the leading lady due to his own insecurities/fears.

Love the friendships in these! Both are about supporting your friends as much as they are romantic comedies. In both of these dramas, the leads knew each other as children.

What they have in common :
Both are Romantic Comedies. Hwang Jung Eum is the leading lady in both. In both, leads met as children and meet again as adults, although there is more of a connection as children between the leads in SWP. Both follow the typical Rom/Com formula (beautiful but unfriendly male lead/ hard working female lead). Both have wonderful second leads.

In both there is a suspicious cast of characters a whole lot of dark secrets and at least one dead body.