Neutrino Observatory in the Nanhai (NEON) is a proposed cubic-kilometer scale high-energy neutrino detector located in the South China Sea. One of its primary physical goals is to capture high-energy neutrinos, which could hint at the origin of cosmic rays. The detector performance is characterized by two parameters, effective volume and angular resolution. In this work, we first give a brief introduction to the design and structure of a digital optical module (DOM) that contains multiple PMTs. Based on the optimized configuration of the array, a maximum-likelihood reconstruction algorithm for sub-PeV simulated track-like events is developed and presented, which fully takes advantage of our array. The angular resolution and effective volume for muons are estimated, and the detector sensitivity to neutrino fluxes is evaluated. We show that NEON in the energy between 1 TeV to 1000 TeV can be competitive and advanced to current neutrino experiments.