It becomes harder for Tae Joon to keep his feelings for Jae Hee hidden from her. Tae Joon's father collapses because of high blood pressure.
Jake leads Martin to Los Angeles, where they team with Lucy Robbins to search for her daughter, who may be the key to understanding Jake's abilities.
Connor is surprised by the sudden arrival of his long-lost sister. Raquel is dropped by her agent and is forced to declare bankruptcy.
Despite Gong Min's pleas for her to stay, Eun Soo still plans to return to her time -- yet there's no way of knowing when the door will open again.
Hyeon Jae circulates a picture that he took of Tae Joon kissing Jae Hee accidentally, when he was under the influence of alcohol.
Mr. Cranky Pants Monster's last customer left with the wrong scooter, and the Monster Math Squad has to learn about patterns to follow the trail.
Se Kyoung learns that Seung Jo is the chairman of Artemis and is shocked. But Seung Jo hears from his secretary, Moon, that Se Kyoung likes him.
Lee Gak now has to pretend to be "the real Tae Yong," while he and his trio send subtle threats to let Tae Moo know that they are on to him.
The Squad help bring about peace and quiet with the little monsters by learning that two sets of objects are equal if they each have the same numbers.
The crew of a charter flight discovers that a menacing alien has infiltrated the plane, and the only one who can save them is a wisecracking convict.
In return for saving Young Hwi's life, Jin Hyuk is invited to stay at Young Rae's home. The spread of mysterious disease plunges the city into fear.
Due to construction, the boys have to stay three to a room, and Eun Gyeol tries to stay with Jae Hee. But that means sharing the room with Tae Joon.
Burdette convinces Bob that the ants would like him better if he were more colorful. / Smooch tries to introduce Winslow to her new caterpillar.
When Sul Joo tells Chae Won that the marriage cannot take place, she asks for an explanation -- but Sul Joo can't give her one.
Wartz gives up hopping, so Snook explains that exercise helps you feel good. Winslow is afraid that someone has stolen the breeze from the World Tree.