The term "Simgeum (心琴)" metaphorically refers to the mind that moves subtly according to external stimuli. 

Part 4. Simgeum is designed to offer an immersive experience of the lively and diverse aspects of Korean culture, beauty, and people that are found within the Land of the Morning Light. Immerse yourself in the diverse and captivating experiences of exploring the Land of the Morning Light through the emotional sounds of the Kkwenggwari that resonate in calmness, the melodious sound of the Gayageum that flows beautifully, and the dynamic sounds of the Daegeum and the Taepyeongso. 

The fifth composition of the 6-part Land of the Morning Light soundtrack, "Samulnori", was birthed by studying the rhythm of the beautiful traditional Korean Samulnori music and reiterating it with computer music. 

"Samulnori," which can be directly translated to "the play of four objects", uses four percussion instruments where each represents a facet of nature: the "kkwaenggwari" as thunder, the "janggu" as rain, the "buk" as clouds, and the "jing" as wind. 

As this genre is rhythmically based and devoid of melody, the resulting music is both exuberant and emotionally charged, is sometimes deeply profound, and conveys a raw sense of humanity throughout. 

This Samulnori music will be used within a variety of "Land of the Morning Light" content, such as in cutscenes and combat.