Rank

Awakened individuals use a letter-based ranking system to determine the strength of their stats, skills, and titles. This system is based on a species-wide assessment of ability, with rankings ranging from the average individual's strength to the absolute upper limit of the species' ability, and beyond.

Rankings
The known ranks include the following, in ascending order:
 * F
 * E
 * D
 * C
 * B
 * A
 * S
 * SS
 * SSS
 * Legendary, or L
 * Myth

F-rank describes the ability of an average member of the species, and is the lower limit of possible ranks. S-rank generally describes the upper limit of the species' ability. Ranks above S describe supernatural levels of ability, and are more commonly seen describing skills and titles than stats.

As the rank increases, its likelihood of appearing becomes increasingly rare. The vast majority of the human population has F-rank stats and F-rank skills, making them overall F-ranks. On the other hand, S-ranks are few and far in between, with only 8 known S-ranks Awakening in South Korea.

In the webtoon, ranks have colors associated with them. These colors are used for individuals' stat and skill ranks, as seen through appraisal skills, as well as for the icons of skills and titles. Known colors include the following:
 * E-rank: Gray
 * D-rank: White
 * C-rank: Green
 * B-rank: Blue
 * A-rank: Pink
 * S-rank, SS-rank, SSS-rank: Gold
 * L-rank: Red

With stats
Stat ranks are determined by the average value of the stats at the corresponding level, as stats tend to average within similar ranges for each rank, with about a 20% jump between ranks. Mana is excluded from the calculation of the stat average, as it is noted to grow slowly compared to the other stats.

Stat ranks can sometimes change as one grows, going up by one rank, but going up more than two ranks is impossible, as stat ranks are a measure of one's innate ability, and growth of three or more stat ranks would require one's natural strength to grow impossible amounts.

The absolute highest possible stat rank one can initially Awaken with is S-rank. This is because, as mentioned earlier, S-rank describes the upper limit of the species' physical ability. It is possible, although extremely difficult, to grow to higher stat ranks, taking years and even decades.

With skills
Skills can be ranked anywhere on the scale from F to Myth with little limit on their rank other than their holder's original ability and talent at using them. Skills of rank E and above can grow in rank with usage; however, such growth is impossible for F-rank skills.

With titles
As titles are gained through completing certain achievements, ranking of titles appears to be based off the difficulty of completing their required achievements. This is supported by the fact that two of the most difficult-to-achieve titles known, Perfect Caregiver and Dragon Slayer, are both L-rank, and both have achievement conditions that are nearly impossible to achieve under normal circumstances.

Titles' supplementary skills and/or stats may be assigned with strengths corresponding to the title's overall rank; however, it is also possible that the title gains its rank based on the ranks of the supplementary skills and/or stats granted by it. The exact relationship is unknown. However, the ranks of a title and its supplementary skills appear to be closely related, with skill ranks being identical or very close to the title's rank.

Titles of B-rank and higher, much like skills, can grow in strength and rank.