One long-struggling team, the Hanwha Eagles — sometimes mocked as the Hanwha Chickens — recently tried to improve its fortunes with cheering robots. The “fanbots” held up screens that scrolled messages of support, uploaded by fans who weren’t at the game; fans were also encouraged to send selfies, which appeared on the robots’ screen faces. The robots were also programmed to do “the wave.” So far, they have failed to lift the Eagles out of last place.

Historically, the Giants haven’t had an easy road either, despite the high spirits at Sajik Stadium. The team has not won the Korean Series since 1992. In the early 2000s, the Giants spent four consecutive seasons in last place; angry fans responded with boycotts, and one game was played in front of just 69 spectators.

The Giants finished in seventh place this year, their worst season since 2007. Fans lamented a “dark age” for the team and demanded the ouster of the current management. Last week, some of them set up a protest site outside a Lotte department store in Busan, complete with funeral wreaths. Giants management issued a statement saying that it “humbly accepts their admonishments.”

“The hardest time being a Giants cheerleader is when the game is going badly and some drunken fans look at us full of anger and try to boo us offstage, as if that’s our fault that the team is losing,” Park Ki-ryang, 23, a cheerleader who has her own fan club, said at the game in September.

Bae Sin-kyu, a 54-year-old fan, knows that anger well.

“When we lose a game, I spit and swear that I will never come again,” Mr. Bae, whose blue jersey was studded with Giants pins, said while waving flags during the game against the Wyverns, which ended in a 10-8 loss for the home team.

“But I know I will be here for the next game,” he said. “I can’t help it.”