Master Key Epi 4 searches for the angel & demon.

Master Key variety show continues with permanent cast members- Lee Soo Geun, Jeon Hyun Moo, Henry Lau, Kang Daniel and Ong Seung Woo hosting along with new guests- EXO's Chanyeol, SHINee's Key, actress Lee Sun Bin, TWICE's Sana, NU'EST's Jonghyun, WINNER's Minho and GOT7's Jinyoung.

Episode 4 featured a typical idol race whereby they enter in the main podium with keys at their desk names. Announcer mentioned that there are two keys among the 12 contestants.
One is an Angel key and another is a Devil Key. The mission is the angel key owner needs to gather his/her best votes to share the winning prize. The Devil key owner who snags most votes and will take all the money to him or herself. There is another factor whereby one of them can start convincing others that he or she is an angel when the owner of the key is a nobody. The so-called nobody key owner who gets the most votes also wins the game and prize money. Everyone is a potential to be an angel, devil or nobody so they put on a poker face trying to cheat each other.

When everyone else is convincing the rest that they are the real 'angel' key owner, Chanyeol just sits behind and observed. Soo Geun asks if Chanyeol is one of the key owner. He shrugs his shoulder and Daniel is not saying anything either. It's a mess with everyone throwing in stating they are the real angel key owner. Nobody wants to admit they are the devil key owner. Hah!
Chanyeol wins the voting game by netizens earning him two votes. As usual EXO-L fans are voting hard for their bias. Previously member Baekhyun has won the special card too. 

The contestants are divided into two teams- black and white (like angel and devil)
Black team is led by Soo Geun with Daniel, Jonghyun, Sana, Minho and Key. White team is led by Hyun Moo consists of Sun Bin, Chanyeol, Seung Woo, Jinyoung and Henry.

First game is running relay game through the two doors which are closed up with parchment paper. The runners are unaware who is in front- smooth hurdles lane or the spiky painful acupuncture mat! They have to remove their shoes and socks for the relay run race. Oooo...Soo Geun challenges Sun Bin while Sana races with Hyun Moo at the start. Surprisingly Sana overtook Hyun Moo without any hassle even though she ran on the mat! She laughs stating it's her first time winning in a running race which embarrasses Hyun Moo. Soo Geun laughs as he picked the lanes with hurdles however he lost to Sun Bin by a nick of time. 

Chanyeol raced together with Daniel with ease as he chose the hurdles lane...Daniel struggles with pain on the acupuncture mat. Soo Geun cracked up seeing Daniel picked three times on the torture mat! His face just turned red and he complained his internal organs are not doing too well. It was a tie-tie when Jonghyun sped through the lanes at ease with Henry whinging away.
As for the last two contestants- Key shook his head in despair as he was never an athletic person. Seung Woo was about the same and shockingly he turned out to be the master of bad luck in a row- he picked 4 times the acupuncture mat while Key was the super lucky contestant without any suffering. Black team chose Key again to race the final around against Chanyeol. It was a close tie as both idols ran with all their might but Chanyeol has longer legs winning the race.

Next game is two teams gathered to shape up something from a dough in a timely manner. The last person to guess what they have moulded up wears headphones so he/she doesn't know what they are making. White team struggles at the start to make Snow White and 7 Dwarfs in the dough as Hyun Moo thought it was some stones from Jeju-do. They shaped up 7 stones and one bigger statue to represent Snow White- who'd have thought it was the cartoon.
They were dished with splash of cold water when Hyun Moo guesses incorrectly. Black team starts moulding a snowman- representing Olaf but Soo Geun guessed it as a penguin! Soo Geun thought the Spiderman was Superman! White team wins when they shaped out the mermaid's tail winning them another point. 

During break time, the contestants start vouching each other that they are the angel key owners...it was a riot. White team gets to text to check if any of the Black team members are the key owners. Jinyoung and Chayeol found out that Soo Geun holds one of the keys. Sun Bin suspects Jinyoung as the key owner. Chanyeol just listened while Hyun Moo tries convincing them Daniel is the key holder since he winked at him. White team discovers that Key, Daniel and Jonghyun are not the key owners. 

Soo Geun kept telling Jonghyun that he is the Angel when all suspected him to be the Devil key owner. Seung Woo, Jonghyun and Daniel starts to have their own little discussion to suspect who are the real key holders. Minho starts his quest by telling everyone he is the Angel. Nobody paid attention to him in requesting to check his key identity too. Hah! Chanyeol successfully convinces Jinyoung, Sunbin, Henry and Seong Woo that he has the two special votes so he is the real Angel key holder. Two teams decided to play the alphabet game - where each member has a Korean alphabet on sticker on their back. They have to dance and try to see the other team's alphabets- guessing what is the sentence they are hiding. White team succeeds first however Soo Geun was too quick and guessed correctly the last game where it's a movie title. 

The very last part, all members gathered back at the podium. Chanyeol tells all to vote for him when Daniel asked what will he get in return- will he get an invitation to EXO's concert? That big puppy is excited to attend every gig he could! Chanyeol gets the most votes- from his own team but he is the nobody key holder- he was pretending to be and won the grand prize to himself. 

The Black team members didn't really vote for Chanyeol. In fact Soo Geun turns out to be the real Angel key holder and Minho is the Devil key holder! LOL! Who would have thought Minho is the Devil when he is so poor in convincing others and remained aloof.