Mountain-Sea Express: A fantasy adventure that should have been about leveling up by fighting monsters—but one delivery sends a man straight into the abyss of desire. He's just an ordinary courier, yet the moment he delivers that package, he plunges into another world. The woman before him radiates a scorching aura; his body starts heating up beyond his control, his breathing gradually breaking apart. In Episode 4, the fox spirit's ultimate seduction pulls them both into complete surrender, lost in the ultimate experience of each other!