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We reexamine high-magnification microlensing events in the previous datacollected by the KMTNet survey with the aim of finding planetary signals thatwere not noticed before. In this work, we report the planetary systemKMT-2018-BLG-1988L that was found from this investigation. The planetary signalappears as a deviation with $\lesssim 0.2$~mag from a single-lens light curveand lasted for about 6 hours. The deviation exhibits a pattern of a dipsurrounded by weak bumps on both sides of the dip. The analysis of the lensinglight curve indicates that the signal is produced by a low mass-ratio ($q\sim4\times 10^{-5}$) planetary companion located near the Einstein ring of thehost star. The mass of the planet, $M_{\rm planet}=6.8^{+4.7}_{-3.5}~M_\oplus$and $5.6^{+3.8}_{-2.8}~M_\oplus$ for the two possible solutions, estimated fromthe Bayesian analysis indicates that the planet is in the regime of asuper-Earth. The host of the planet is a disk star with a mass of $M_{\rm host}= 0.47^{+0.33}_{-0.25}~M_\odot$ and a distance of $D_{\rm L}=4.2^{+1.8}_{-.14}$~kpc. KMT-2018-BLG-1988Lb is the seventeenth microlensingplanet with a mass below the upper limit of a super-Earth. The fact that 14 outof 17 microlensing planets with masses $\lesssim 10~M_\oplus$ were detectedduring the last 5 years since the full operation of the KMTNet survey indicatesthat the KMTNet database is an important reservoir of very low-mass planets.

KMT-2018-BLG-1988Lb: microlensing super-Earth orbiting a low-mass disk dwarf