Hacker and Alien.

Summary

Xiao Yu and her father are investigating the "Mosaic Online Game" upgrade system after discovering discrepancies between the original and the current system. Xiao Yu suspects tampering while analyzing the upgrade's slow performance. Her father, a seasoned gamer, shares his experiences with slow upgrades from past games. They both realize that the upgrade issues might stem from the programs Xiao Yu upgraded rather than the upgrade system itself. Despite their efforts, they find no significant problems except for the slow upgrade, prompting Xiao Yu to conduct a thorough analysis of the game's program functions to identify any underlying issues.

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