ChinJum

Film
Chin-Kung is the Martian king and invades Earth in order to obtain the magic pearl to further his conquest of the universe. When he and Jumkiller Jr. land in Taiwan, the location of the magic pearl, Jumkiller Jr. suggests blowing up the Earth in order to get it over with. Upon hearing this, Chin-Kung belittles Jumkiller Jr. by calling him stupid. Jumkiller Jr. agrees with this statement before suggesting just going by himself to find the magic pearl, but Chin-Kung shuts down this idea, instead wanting both of them to search for it. They both search for the pearl, destroying cities and killing hundreds in the process, but they do not find the pearl.

Later, Chin-Kung and Jumkiller Jr. are in a meeting, with Chin-Kung being angry at not being able to find the magic pearl. Jumkiller Jr. asks if Chin-Kung has a better plan, to which Chin-Kung responds by calling Jumkiller Jr. an idiot, and that he must send his brain to the wisdom plant for readjustment. Jumkiller Jr. agrees to this and asks Chin-Kung to enlighten him, to which Chin-Kung responds by telling him that they could find the magic pearl by following the bright light it gives off at night. Jumkiller Jr. manages to track down the pearl by using this method and is very excited that he has pleased his master by doing so.

Later on the Moon, Chin-Kung has successfully manufactured the magic pearl for use in the sun ray mirror, a weapon that can destroy the Earth. Chin-Kung and Jumkiller Jr. both celebrate before they use the sun ray mirror, destroying even more cities in Taiwan. Unbeknownst to Chin-Kung and Jumkiller Jr., scientists at the Taiwanese and American space agencies now have a way to beat them, an American robot and a Thai temple statue possessed by a God, both equal to the height of Chin-Kung and Jumkiller Jr.

Jumkiller Jr. becomes nervous at this and freaks out, but Chin-Kung tells him to calm down and reassures him that the American Giant and Temple Giant are going to die. However, this doesn’t work out, with Jumkiller Jr. failing to attack them during the first leg of the fight, hugging Chin-Kung and begging for forgiveness from his master who is now enraged. In the last leg of the battle, Jumkiller Jr. dies first, accidentally being killed by Chin-Kung when he meant to fire the sun ray mirror at Temple Giant. Chin-Kung is visibly upset by Jumkiller Jr.'s death, but this doesn’t last long as he’s later killed in the fight by American Giant using the sun ray mirror.

Moments

 * There are several moments where Chin-Kung belittles or humiliates Jumkiller Jr., often calling him stupid. Jumkiller Jr. usually playfully agrees with Chin-Kung when he makes these statements towards him. It seems that they both find this fun as Jumkiller Jr. never takes these statements seriously except for when Jumkiller Jr. is clearly legitimately angry at him.
 * Jumkiller Jr. is often very excited whenever he pleases Chin-Kung, this is most prominent when he manages to find the magic pearl.
 * When Jumkiller Jr. first fails to kill Temple Giant and American Giant, Jumkiller Jr. is legitimately angry at him for this. Jumkiller Jr. hugs Chin-Kung and begs for forgiveness but Chin-Kung doesn’t return the favor, instead using his magic bow to cast them somewhere else for the time being.
 * There are points in the final battle where, when scared or nervous, Jumkiller Jr. hides behind Chin-Kung as a form of protection. Chin-Kung seemingly isn’t bothered by this, and is even seen earlier telling Jumkiller Jr. not to freak out when he sees that American Giant and Temple Giant are heading towards the Moon.
 * When he accidentally kills Jumkiller Jr., Chin-Kung is visibly very upset at this, sending him into a rage that is ultimately part of what causes him to be killed.

Quotes
"My god.. you're a fool! I must send your brain to the wisdom plant for readjustment!" - Chin-Kung upon hearing Jumkiller Jr. ask him if he has another plan

"(laughs) I've got it! The great Chin-Kung will be pleased!" - Jumkiller Jr. upon finding the magic pearl

"You have dishonored me.. you must die!" "Oh great Chin-Kung, forgive me! Please my lord! Please my lord, forgive me!" Chin-Kung and Jumkiller Jr. after failing to kill Temple Giant and American Giant

Fanon
ChinJum is the most popular ship in the Mars Men fandom. Most of the evidence for this relationship comes down to Jumkiller Jr. being very submissive to Chin-Kung’s dominant nature, them both seeming to be playful with / enjoy this, Jumkiller Jr. hugging / hiding behind Chin-Kung when he’s scared, and Chin-Kung being very upset at Jumkiller’s death. Seeing how the film and its characters are very obscure, It’s likely that it will remain unconfirmed on whether Chin-Kung and Jumkiller Jr.’s relationship was mutual or something more.